Belief in Islam produces a darkened intellect. Islam does not reveal God and His infinite perfection. Christians “honor God by faith, which is of the mind, by hope, which is of the will, by love, which is of the heart; and thus the whole man is subjected to the Supreme Maker and Ruler of all things.” – Saint Pius X.
But Islam is the opposite because Allah is not God, the Maker and Ruler of all things. Allah is Satan, the Liar and Destroyer of all things, therefore Islam honors Lucifer by faith (in evil) which darkens the mind, by despair which leads the will to commit rash actions, by hatred which leads the heart to destruction of Truth, beauty and goodness.
Therefore a person inspired by Lucifer’s Islamic religion and taking up a knife and slitting another person’s throat or beheading journalists, raping children, pillaging, and destroying are all par for the course. They are all actions which are natural consequence of love of evil, death and destruction.